n-gauge standard track radius

Hi,

Does anyone know what the standard N-scale track radius is for the Peco ST

12 and ST 15 curves? (measured to track centre lines)

Also, the Flieschmann products have radiuses of

1: 192mm 2: 225.6mm

While the Minitrix products have radiuses of

1: 194.6mm 2: 228.2mm

It would seem that these two types would be incompatible, or is the difference so small that it would be easy to "make it fit"?

Has anyone any experience of either of these products? (which would be the best to build a pair of hidden 180 degree turns?

Thanks,

Mike