Higher Category RJ Connector On Lower Category Cable?

I got a question I just can't seem to find an awnser for on the internet. I wasn't quite mentioned in the several cabling guide's on this site.

If you use a higher catagory (e.g. CAT6a) on a lower quality cable (e.g. CAT5e), does it deminish the quality of the signal ? Or can you always use a higher catagory connector ?

I'm asking this cause we saw that the CAT6 connectors are more expensive then the CAT6a for some reason at our prefferred supplier.

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