The only way really to tell is to test, but I would think that if they will make it, it will be at slow speed...
The snap switches have different geometry than the numbered turnouts (#4, #6, etc). The snap switch goes into an 18" radius curve to make it easy to fit, especailly on 4x8 layouts that use 18" radius sectional track.
True numbered turnouts diverge at a given angle. This angle is easiest to understand as a number, so that's why they're labelled like that. A #4 diverges 1 unit away from the main route for every 4 units of distance travelled. A #6 takes 6 units to diverge 1, and so on.
The important thing to remember is that they are not interchangable in track plans. If you use a #4 in place of a snap switch, for example, you will need to alter the trackwork to make it fit.
Andrew