Yep. They are typically slightly oversized for fitting
https://gungrip.com/lcsmithbuttplatesandgripcaps.aspx

Probably the same product
https://www.dixiegunworks.com/index/page/product/product_id/3550/category/391/category_chain/350,389,391/product_name/MP0013+Grip+Cap+-+L.C.+Smith

The original hard rubber caps turn very slightly olive colored over time, which the black plastic does not.
Interesting thread
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=161859&page=1