Awning sizes...how critical?

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Hi, we're just moving up from a Swift Challenger 625 to a Conqueror 630. We have a 1050 size awning, but the new 'vans A measurement is 1065, and Isabella recommend a 1075. Does anyone know whether my existing awning will fit? My guess is that it will, but
it may leave too much gap at each end...Thanks, Shaun