I'm 99% sure it's 0 on block ( both f2 and u34 ) , also a blocked u34 at contact range gives you the perfect spacing for a d3 to hit the opponent where f2 gives more pushback and d3 will not always reach the opponent but that can be used to bait a lowpoke and punish it by backdashing into b34 / f2 b21.
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Somberness could confirm that if he's got time