I'm not the best to speak on this but the CVCC 1500 is obviously bigger & heavier that the standard 1200 with a cast-iron block instead of alloy, combined with their stricter emissions priorities largely negating any power gain and giving the cars a heavier more substantial feel overall.
I gather early examples didn't rev as happily as 1200's and their carburetors are far more complicated to create separate "rich" & lean fuel mixtures for the "stratified charge" within the engine which can cause headaches trying to stay original. And if the cars are neglected & allowed to overheat the extra heat generated by the lean mixtures can blow head gaskets & even warp blocks which some don't notice 'till they've replaced a few head gaskets. The 1500 is closely related to early Accord & Prelude 1600 & 1800 engines (also CVCC in the US) which might make those conversions easier.
For those that don't mention which engine the have, 1200/SB non-CVCC have exhaust out the front "crossfow" , 1500 CVCC have it out the back "non-crossflow" though if you find pictures you might spot the extended front paneling of the CVCC cars.
'79 Accord, '89 CR-X SiR, '81 Prelude, '74 Z360 H/T, '71 Z360, '64 S600, '75 Lancia Beta.