Some of it is.
Suspension is mostly the same, however I believe the front subframe has the wishbone mountings furhter out from what Chip etc on here has said.
If its non-abs it'll be a closer relation to the Ph2 172 Cup than a non-cup.
Shocks/springs all transfer.
Edit: 182 has some things different, Extra caster wishbones (same as fitted on 172 Cups), Larger wheel bearings in the front hubs.