Very similar. At the moment Kaido seem to have had a deeper crew though (not necessarily stronger individually) with the top 4 arguably being very close in power level.
Jack & Apoo > No known equivalent
6 Tobi Roppo > 4 Blue commanders
Headliners (incl Hawkins) > No known equivalent
30.000 men - No known equivalent
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There are similar individual's but Sabo is clearly King's counterpart. Official seconds of the crew, strongests after their captains, and not their leader's son.
That, coupled with Dragon's fruit being unknown (and certainly not the same as Kaido's) makes it so only the Ivankov and Queen parallel's stands, and even then they don't really share rank, as Ivankov is tied in rank with 4 other people (Morley, Karasu and company) unlike being a clear number 2.
Sabo is clearly Yamatos counterpart and Aces.
Oden - King - Kuma are the right hand men.
Oden is the only man to be called little brother instead of son.
Alber was hand picked by Kaido and bestowed the title of King.
We are about to see Kumas position before doing his special mission but we know he was a literal King (same pattern as Hell King Zoro, Dark King Rayleigh, "King" Alber).
Sabo - Ace - Yamato are the Aces. Groomed to become new captains in due time.