No, the geometry is NOT the same.

The R1 curve and basic straight segments of tracks are similar; 360cm radius and 180cm long. (although no 180cm long C-track exist!)
However, the parallel R2 and the short switches are a little different.
Huge differences appear when you go to slim switches (R9) or if the original trackplan uses flexible tracks. These parts must be redone completly (if at all possible) with the VERY LONG slim switches from the C-track, and segments of tracks instead of flex-track. -Also remember that C-track does not have a slim DKW.

A list mathing K to C does not exist, and would not be of any use anyway, because of the above mentioned differences.

Track-plans found in the Märklin Magazine are normally developed for the two track systems, and the magazine often shows both.

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If you could find an M-track plan to your liking, that would be very easy to transform to C, as the basic geometry is similar...

Hello Jonny

Which layout would you like to transfer from K to C-rails ?

I have got more than 30 years of Märklin Magazines ......

Marklins track plan book for layouts over 10 feet gives the parts for K track at the back of the book. So if you found something you liked you could also build with K.

dave

Hi John. THe track plan book gives details of layouts which can be used with both C and K but there is no comparison for both types of tracks because as Henrik says the geometery is not the same.
If you like C track as you say then why bother with K unless you want to ballast by hand perhaps in a station area. Any layout with C track can also be used with K if you are prepared to make a few changes in size and design but the overall shape can be much the same.
You could copy the layout from the magazine then design your own version using either or both type of tracks.

dave