^^^ True
the K24A2 (TSX) has the same 3 rocker 3 lobe VTEC as the K20A2. The head casting is about 95% the same. The K24A2 head just has a coolant crossover that goes through the IM. hondata makes a spacer/adapter kit where you can use a K20A2 or K20A type R intake manifold with the K24A2 engine.
here is a link to an old page on the hondata website about tuning the K24A2. I saved the link and it still works, although last time I checked there is no link to it on hondata's site.
http://www.hondata.com/tuning_the_tsx.html
If you are considering doing a K24 swap, then dont waste your time with the K24A's with 2 rocker VTEC. Its the same as the Base RSX K20A3, its just not the same feeling as the 3 rocker VTEC and HP is harder to make. You can get a K24A2 with 6 speed tranny for less than $3000. you can get it with just the longblock for about $2000. You will want to use a hondata reflashed RSX-S ecu or a K-Pro system since K24A use drive-by-wire and therefore use a different air/fuel metering system and will not work with any other systems. you will want to swap the intake manifold and TB to the RSX-S or K20A type R units that run a throttle cable, map sensor and tps sensor like your civic.
your best bet and best bang for the buck will be the K24A2. If you get one of the 2 rocker K24a's, you will have to spend a lot of money to get it to put down the over 205whp a stock K24A2 will do with just a reflash. The stock air/fuel program in the Ecu on a TSX absolutely sucks. Hondata has a reflash that adds 25whp to a stock TSX. look at the link I added.