The PC 100 modules are backwards compatible, but if your computer won't benefit from using a PC 100, it is not recommended. The general overall rule is to match gold leads with gold contacts and tin leads with tin contacts. When you mix the two metals you speed up the natural process of corrosion. When upgrading, confirm what type of connectors and leads you have, then order the same. This rule will not always work since it may not be possible to get the correct match of gold leads with gold contacts and tin leads with tin contacts.
Problems are rare but can happen.
To prepare yourself and to help keep your computer at its best level of performance, here are a few guidelines to help you. When you first upgrade the memory, ground yourself, then as you are installing the module, do not touch the surface of the connecting pins. Any moisture or oils that can come from your fingers can speed the corrosion process. Try to have your computer in a low humidity area with a normal, stable temperature. This will help more than just your memory.