1999 Toyota Camry 4 cylinder

The first thing about the motor you are looking to buy is that is a Japanese Domestic Market Motor, JDM,. It came out of a car sold in Japan. The good thing about Japanese motors is that there is law that at 30,000 miles, the engine must be replaced or you have to buy a new car. Cars are so cheap there, most people buy a new car. So, there are toms of motors with 30,000 miles on them being imported...but buyer beware. Some importers by a lot of motors blindly without seeing them before they arrive and some could have damage, many people do not maintain the motor as it is going to be scrapped anyway, etc. The good importers have buyers in Japan that pick out what gets sent to the seller.
Point being, really research the engine seller as many have bad reps for selling bad motors. Good importers do compression and leak down test and guarantee startup.

The fourth character in the engine code is the type of engine. The American code is a B motor and the Japanese code is a Y motor. Codes do not change for engines when imported for logistical reasons. This does not mean it won't fit in your car, but you might have issues.
Do some research for a good importer. The best place to find this information is in enthusiast forums. This is a free community of car owners that love there cars and share their experiences and ask questions, sell parts, give reviews, etc. To join you only need a screen name and provide an email. You will find that good importers are hard to find but at least the bad ones get well advertised as being unreputable.
Next, a good importer would re-assure you it is the same engine. While the block may be the same, the intake, sensors, oil pan, etc. may be different and you will have extra labor installing the engine.
So, find a good importer and stick with the, "B" code engine.

Here is a link to help you further decode engine and VIN codes;

http://www.4crawler.com/4x4/ToyVIN.shtml#Engine

This is a general break down of VIN codes. It is only valid to 1995, but it helps to understand VINS as the engine code is still in position 4 today. So, take it with a grain of salt.

I could not dind a lot of information on the motor in your car. Is it the original engine. Because what I found indicated it might be older. The Y engine that you bought from the salvage yard is a 2.0L. I could not find any engine sap information, but the information I found indicasted that they are not in the same engine family.

I cannot tell you whether it will fit or not. With the right motor mounts, a lot of work, money and sometimes the exhange of the lower front subframe. Any engine can fit.

However, depending first on how much came with the motor, e.G; motor mounts, wiring harnes, sensors, intake, exhaust mainifold, accessories like the alternator, A/C and power steering pump, computers. And the list might be longer depending on what will switch over from one engine to the other, you might end up spending money on a lot of parts that you will need to make the engine fit if you don't have everything it came with.
My advice is to get the same engine so you will know it fits and you will not need to buy anything parts wise that you don't already have.

To find the best engine for your car, look on-line for a japanese domestic Market engine, JDM. This is a motor that is from a Japanaese car. In Japan there is a law that at 30,000 miles, you have to get a new engine. So, there are a lot of American importers who buy these motors and sell them as they are almost new.
They will shipp them to your house and there are a lot of places on the internet that sell them. So, first find a JDM Engine dealer and check on their reputation. It will be easy to track down.
Replacing your motor with the same motor is the best way to go and is going to end up probably being more economical.
You could be getting yourself into a huge nightmare with the salvage motr as you don't know if it will fit and you don't know if the parts from your engine in your car will work with it.
It may fit in the car, but the computer may not work with the engine, there are so many things that can go wrong.
Also, with a JDM engine from a good importer, you will not only get a low mileage engine, you generally get all accessories and in some cases get every part from axle to axle.
I am sorry I cannot tell you if the motor will fit. There is just not enough information at my disposal to promise you that.
I hope this information helps and check on JDM engines. They are worth it and replacing your engine with the same engine will be worth it.