A question of Scale 1/25 vs 1/24

Just wondering - why do Revell make both these scales - and is there really much difference? Interchangeability of parts eg wheels and tires - or will they look out of scale?

I don't understand why they aren't simply all the 1/24 scale (which after being a Tamiya modeller all my life - was the norm for me)

 

Cheers

Source: http://cs.scaleautomag.com/SCACS/forums/thread/999033.aspx

John Cannon Eitel Cantoni Bill Cantrell Ivan Capelli Piero Carini