Question about the difference between Su-27 and Su-33

Su-33’s armament tech tree:

Su-27’s armament tech tree:

While examining the two pieces of fighters, I noticed a difference. Su-33 does not have R-27R/T, only R-27ER/ET, but Su-27 requires separate research on R-27R/T.

Is this just a difference in research, or is that because Su-33 has never actually used the R-27R/T in real life?

The difference between both planes is the following:
Su27 has double the ammount of countermeasures compared to the su33
(96 vs 48)
Su27 is around 2 tons lighter and as a result has better flight performance
Su33 is able to carry 2 more r-27’s
Su33 has a better RWR than the Su27

It seems that way, there isn’t really anything saying that the su33 carried the r27r or r27t, but it theoretically might still able to use them irl

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thx for reply! :)