no. 81 to 83 I beleive, maybe earlier, 22rs had double timing chain... 84 I beleive is when they stopped.... so 20r and dual row timing 22rs should have the same unless not all 20rs are double timing chain ??? either way the answer to your question is no lol

 

basically the dual row timing chain covers are interchangable and all the single row timing chain covers are interchangable, not across