98 engine in a 94 FD3

[ttpower]

Hi guys, a bit of help needed. I have located an engine out of a 1998 RX7 with very low miles that i want to replace into my 1994 RX7. Will i incur any problems, i know that the 95 is slightly diffrent in some respect such as ecu etc... any help would be much appreciated, need my car back on the road asap.