PCM Diagnostics & Tuning - Which computer

Hey guys quick question do the LS1 and LT1's computers have the same casing? Like do they look alike. I have a computer here and was wondering what it is from? can anyone help me out with wat to look for

Check the part number and call a local dealership. They should be able to tell you what it's for.

What about on the spot type things? Like wat numbers should I look for?