It is indeed the former Coltishall guard. Several links found but this one gives a fairly good coverage including the relocation and closure of Coltishall:
Why not have both... looks to be enough grassed area for them... they would look very nice side by side in the same pose with one just slightly nose ahead of the other.
Great pic by the way... saw her many times on Colts gate when visiting.
Paddyboy....I feel your pain... always was my favourite RAF Station.