They are pretty much all the same, only difference is vtec and power numbers, hence B series engines, basically same size, only small differences. I would suggest doing a b18b buildup or even an ls/vtec setup but for you i wouldn't recomend it.
What are your goals for the car?
Turbo? keep the ls or swap the b18c if you have the dough.
N/A b18c5, higher compression, more hp.
Also what is this going into? I'm assuming an rs/ls/gs integra?
IMO and no body conversions are necessary.
get another B18B cheap... all you need is a long block
build up the B18B for turbo
***its up to you whether you want to put the newer one in the car and build the old one or keep the old one in there and build the new one
then id go after a JDM GSR tranny with an LSD
now, for about what you would have spent on a swap, you have a fresh engine built for boost, a better tranny, and still have a spare engine / tranny incase something breaks