Absolutely, do not switch! The MB coolant, which is an HOAT type like the G-O5, is far superior to the green-snot-o-death. MB lead the way years ago, with the other European, GM,and finally Japanese manufacturers dumping the conventional green coolants. To my knowledge some 2002 Ford trucks, and maybe some of the DC US models were the last to come from the factory with the green stuff. Don't keep up with the Korean brands.
Don't know what exactly the Volvo blue/green type C is, but it is not a traditional eg coolant, and Zerex lists it's G-O5 formulation as the closest easily obtainable replacement. Ditto on the MB coolant.

The only reason to use the green-snot-o-death, is that it is the only other common coolant choice if you are using an all metal radiator with lead solder, and you don't want to use an HOAT/G-O5 type for economic or other reasons such as ease of supply. Or you just don't want to flush the system to switch over, 'cause it's already in there.

Here is a link to the BASF site showing some of their Glysantin coolants. Check the product approval list/specs, the MB coolant may be the G-48? http://www.basf.de/en/produkte/chemikalien/spezial/glysantin/productrange/?id=V00-AFkfh8OxLbsf2dK

and more product specs sheets: https://www.valvoline-technology.com/data/VALV/ValvExtSecurity.nsf/fsZerex?OpenFrameSet

and one more: http://www.englefieldoil.com/PDF/Zerex_chart.pdf

That last chart from Zerex seems to suggest that the MB is factory filled with G-O5, and the Volvo type c is the G-48.
--
Gary Gilliam Sumerduck VA, '94 940 na Regina 170k '86 240 199k, 93 Camry 4cyl 5spd 245k