The 'exploding piano' bit was never used in any

cartoon. Sylvester did suffer the indigities of pianos being dropped on him in
Canned Feud and
Muzzle Tough, which resulted in the standard 'piano keys as teeth' gag. But as you correctly stated, it was in the first DFE

short, the Robert McKimson-directed
Rushing Roulette.
This bit was even recycled by
Hanna-Barbera in the TOP CAT episode
The Missing Heir. The victim was a semi-articulate guest bulldog (with the oft-recycled Don Messick snicker) who was the henchdog of the greedy butler in the old 'inheriting the fortune by killing the benficiary' chestnut. It was rather surprising to see this type of gag in a series originally made for prime time. TOP CAT, along with
THE FLINTSTONES and JETSONS generally favored dialogue, satire and character-driven humor over the heavily violent comic slapstick associated with contemporary H-B shorts- not to mention theatrical shorts from virtually every
animation studio.
One studio copying a gag from another is hardly unusual. With many writers and directors moving from studio to studio, it's to be expected. The migration to H-B of longtime WB writers Warren Foster and Mike Maltese had a huge influence on the latter studio's 'house style'.
Original TOP CAT credit sequences have long been lost, so there's no way to identify which writer wrote which specific episode. The WHV DVD release of the series nicely carries a newly-manufactured gang credit roll- which includes Maltese. For all we know, he could've written the episode in question and incorporated the piano gag. (Warren Foster, who wrote
Box Office Bunny and
Show Biz Bugs, is not listed as a TOP CAT writer. He must've been busy with THE FLINTSTONES and THE YOGI BEAR SHOW.)
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