Ajax very definitely is. The Ares version, however, has no turret, just an RWS and more interior space and is classified as the series APC version. It's tough finding info on its pax capacity although I have found its complement to be a crew of two and room for up to seven dismounts.
I haven't seen anything specific on how the Brits are doing the new version of cavalry and have been looking at it as an analogue to how they used Scimitar, Spartan and Stryker. I see Ajax as the Scimitar recce/surveillance replacement and Ares as the Spartan infantry carrier replacement. Since there is no specific Stryker ATGM replacement, I think they are using Ares with dismountable ATGMs. A recce sqn used to have three recce troops, one ATGM troop and one support (infantry) troop.