Mine is the original part. it appears to have no numerical markings.
I would feel comfortable as long as it functions under normal circumstance. IE, fires reliably (even if you ride the slide) and reloads reliably.
If it pushes out of battery in a holster during a press check and will not go back to battery, the part is broken. I would send it back under that circumstance.
Seems like the more expensive "high end" pistols just make my old G17 seem so much better..