Why are you comparing OCR to CCR?
You don't have to, anyway, even if you want to compare, bargain hunter already provided you that CCR Yong Ann Park's return ($437 psf to $1858 psf or 325% return) is higher than OCR Bedok Court of $205 psf to $557 psf or 172% return (if you just want to take 1 and compare, but this is not meaningful).
Instead, you should be comparing OCR to OCR, and
it is obvious that Bedok Court was sold at that lowly $557 psf NOW (when OCR private property prices are their historical HIGH) was because it only has 65 years lease left!
You just need to compare to other FH condo nearby and you would know that they can command easily more than $1000 psf! Even if you adjust for the big size, it should easily command >$800 psf but instead it could only sell at that lowly $557 psf (if not for the lease running down to ZERO),
a figure much closer to HDB flat $psf price!
As to the quantum, he could have bought a smaller unit than 6xxx sqft at the same absolute quantum and still profited much more in % terms!