The K24A1 is in the CRV and has 9.6:1 compression. 160HP at 6000RPM and 162 lb-ft. at 3600RPM.

The K24A4 is in the Accord with 9.7:1 compression. 160HP at 5500RPM and 161 lb.-ft. at 4500RPM.

It's mainly an issue of tuning. The CR-V's has a slightly lower compression ratio, and a much better torque band at a lower RPM. Torque is key for a heavier vehicle to get up and go. This comes at the sacrafice of top end power, where CR-V owners are less likely to stretch the needle to.