We have had our mini for a year and we bought a couple of these lids and some extra non-stick inner pots. The lids all worked fine with our original stainless inner and the extra non-stick ones.
Then decided wanted an extra stainless so ordered the "genuine instant pot" stainless inner pot. It now has 18481 just below the Instant Pot logo on the side.
The silicone lids don't fit this one!!!
After multiple emails back and forth, and sending a bunch of photos and receipts for both pots and lids, finally got this from Instant Pot:
"Currently, the slightly newer design is not compatible with the silicon cover however we are working towards rectifying this. We sincerely apologize for the inconvenience, and we appreciate your understanding."
So will they revise the lids? The new stainless pot? Don't know. All I know is that I have a non-compatible inner pot which is a problem as these lids work great.