Well, I just tried fitting a CL coil onto the base of one of my original v1 (non-OLED) Egrips and it does NOT fit. So unless the OLED version comes with a different base than the original, then I don't know. Or unless the Joyetech site is wrong (which it very well could be), they make it appear that both CS and CL OLED versions can use CL coils. In that case, there is no difference between the two OLED models other than the coils it comes with and they both have CL/R compatible bases. OR, they started selling the CS versions with the CL base, which would be smart because thats more Joyetech coils people can buy.
OR, they are both completely wrong and the CS version still uses the CS base (original v1) and they MEANT to say that the OLED CS version is COMPATIBLE with the CL coils IF you use the CL base (which they do not say on the site). Maybe someone could ask Joyetech to clarify. But yea.. the CL coil does not fit on the original base that comes with the non-oled Egrip. If someone has a CS version of the OLED, then maybe you can find out if your base is like the original v1 or if it can fit CL coils, in which case would make it a CL base.
But for the record, the bottom of my base says "eGrip CL". I think what Joyetech meant to do was to only have 1 version of the Egrip OLED but released the CS version first before they decided they wanted it to be compatible with the CL coils. THEN, they started selling the kits with the CL base but for some reason, they are marketed as two different types of Egrips. To make things less confusing, they could simply have an option to order the Egrip OLED (none of this CS or CL crap), and let you choose whether or not you want the CS or CL coils. The CL base should be included if it is compatible with all other coil types since the CS can't use the CLR, and they could even include 1 of each coil so the user can decide for themselves which one they prefer.