Wheels from Nissan Kubistar on Renault Megane 1: compatible?

No, the centre bore is too small

Same 4x100 PCD, but the centre bore of the wheels from Nissan Kubistar (60.1 mm) is smaller than the hub of Renault Megane 1 (66.1 mm): they will not fit without being re-bored by a professional.

Nissan Kubistar2003–2009Renault Megane 11995–2002
PCD4x1004x100 / 5x114.3
Centre bore60.1 mm66.1 mm
ThreadM12x1.50M12x1.50
Original wheels 5Jx13 ET36 R
≈5.5Jx13 ET36
≈6Jx15 ET43
≈6Jx15 ET35

≈: 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 Renault Megane 1 (M12x1.50), 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 Renault Megane 1 on Nissan Kubistar?