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On the rear face of the magazine, for the No1 Mk3 there are two "catches", while there's only one for the No4 mag. They are not interchangeable. Both typically sell for the same prices, between, say, $25 and $40, in my experience.
The Short LE mag has a rib going all the way down the back. The No.4/No.5 mag has the rib going only about halfway down. These are not interchangeable (and the follower is not the same either)
Which one are you looking for? The price depends on condition. Servicable condition $30.00 Correct markings for rifle average...$45.00....Unissued $60.00. May very slightly on who is selling.