How to identify a Cummins engine 400 or 450

[rraccerr]

Hello everyone,
Yep! It’s dumb dumb again. As you know from previous post, I had my isx15 2350 400 rebuilt. Come to find out;that instead, the mechanic said my block was cracked and he replaced block with a 450 (don’t know year, don’t know much about it,because I just typed in my engine ESN and quickserve gave me all the info. Open the hood today and saw the same esn on side of engine, I’m sure everything came off old engine and fitted onto this block. Long story how this happened without me knowing. But now I have a new injector I already bought for the 400 and I want to put it on this engine. Can I do it?
2. If it’s not an ISX 15 2350, what is it?
3. Won’t learn unless I ask
Mechanic doesn’t speak English very well, so getting the right info is difficult.
Ok Team, where should I start ?

Thanks for any and all reply’s

[Rawze]

maybe get the part#off the engine block and check it against your old engine on quickserv.

[rraccerr]

Thank you rawz

[BATURALAN]

Send me your ESN and E/C from your ECM and I’ll let you know