Breathing new life into the 318 in the Scamp!

This shows the differences, between the lifters that I have.

Height -



Oil ring location -



Plunger designs -



Replacement sent from Hughes on the left, original, shorter lifter on the right.

To be fair, the lifter set that I purchased, was purchased over ten years ago, so I don't blame them on mismatch and I don't even care, as long as it will work properly. My only concern would be possible dissimilar oiling on this lifter or anything causing a chain of events that are irregular on this bank, from the lifter having a higher oil ring. The hole size in the ring is the same size.

Does anyone here have experience with replacing a single lifter that isn't identical, successfully?