Can you use shimano m8000 replacement cogs to replace Sunrace mx80 cogs? Can one use m8000 replacement sprockets 11T 13T 15T to replace the corresponding mx80 sprockets?

I appreciate the clusters can't be switched due 3 free sprockets and 2 clusters of 4 on mx80 vs 5 free and 2 clusters of 3 in the m8000, but what about the first 3 sprockets?

mx80
https://factoryjackson.com/2017/04/19/sunrace-mx80-11-50-11-speed-cassette/

m8000 cogs
https://www.hibike.com/shimano-cs-m8000-11-speed-sprocket-11-pa913bedaac0e23a55c569d6d78f42bc7
While this is not a definitive answer it may help with your decision. If you look closely at the mx80 you can see that some of the teeth on the larger cogs have some extra machine work (notches) done. These areas are to facilitate the chain moving from one cog to the other. For optimum performance the "notches" must be correctly aligned. The variation in the width of the splines on the freehub make this alignment foolproof. Looking at two 9 speed cassettes in my parts bin, the indexing of the notches on the cog and its position on the freehub is not universal between all brands. What this means is that while the cogs may fit, shifting  performance may not be optimized.