Doubt there would be that much difference, as the sacrifices made to accommodate a longer case don't add up.
All being equal (same action, barrel length and twist rate, bullet used), a few hundred fps more (being optimistic here) will not mean much in the grand scheme of things if the rifle actually has to be carried a great distance. Cramming more powder into a case (7x57 should be about 8-10 grains more H20 capacity) won't be worth it for a marginal increase in speed unless it's just a numbers game.
The fact that 7x57 is a 'long action' cartridge, and the 7mm08 a 'short action' one, brings up the whole '6.5 CM vs. 6.5x55' debate, and unless you live in Scandinavia, the latter cartridge is not the better choice.
Good reason why people are choosing to build 7mm SAUM's instead of 7mm Rem Mags now.
....except in a little backwater called New Zealand/Aotearoa....where people can buy factory 7mmRM off the shelf...no such luck with 7mmSAUM.
While both will do the same job - poke holes in animals from a good distance.... if you are travelling between islands and want to buy ammo wherever you end up - you have no show of finding SAUM...
Refer to an earlier post which succinctly pointed out how stupid threads in this vein are...
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