Riain
Banned
IIRC hydrogas was an addition by the Brits when modding the FV 4030/3 to the FV 4030/4 (CR1) standard that better met British Army requirements.
The Shir 2 had Horstmann or an obscure Super Horstmann suspension and as such weighed 63 metric tonnes instead of between 59.4 and 62 metric tonnes for CR1 depending on the sources. Shir 2 also lacked TOGS and its barbette, had a different smoke discharger arrangement but might have got a different FCS, an ESR barrel and a panoramic sight like the Shir 1/Khalid.
Sure, but they're details on top of the big stuff like powertrain and Chobham armour. I'd guess that if Britain was involved with the 4030/3 from the start it would have hydrogas suspension.
Also I'd think if the Chieftain 24L RR V8 had 800+hp it's replacement would be bigger than 26L and 1200hp.