Wheels from MG Marvel R on Chevrolet Camaro: compatible?

No, the centre bore is too small

Same 5x120 PCD, but the centre bore of the wheels from MG Marvel R (67.1 mm) is smaller than the hub of Chevrolet Camaro (70.3 mm): they will not fit without being re-bored by a professional.

MG Marvel Rfrom 2021Chevrolet Camaro1969–1982
PCD5x1205x120.65 / 5x120
Centre bore67.1 mm70.3 mm
ThreadEcrous - 14x1.50Ecrous - 12x1.50
Original wheels ≈7Jx18 ET50 R
R
R
R
≈7.5Jx18 ET32

≈: width estimated from the original tyre size.

Before fitting the wheels

An identical hub is not enough: offset, width and diameter change the position of the wheel, and larger calipers can touch a smaller wheel. Original wheels often use bolts or nuts with a specific seat: keep the fixings intended for the wheel, with the thread of Chevrolet Camaro (Ecrous - 12x1.50), tightened to the torque shown on its vehicle page. Finally, check that the size is among the approved fitments for your vehicle. This comparison is for guidance only: have the fitting approved by a professional.

And the other way round: wheels from Chevrolet Camaro on MG Marvel R?