The R15M and R15 V4 are two different types of Renault vehicles. The R15M is a hatchback, while the R15 V4 is a sedan. Both cars have different engines; the R15M has a 1.2-liter engine, while the R15 V4 has a 1.6-liter engine. The transmission and drivetrain are also different; the R15M has a manual transmission, while the R15 V4 has an automatic transmission. Finally, the dimensions of these two cars are different; the R15M is 4,063 mm long and 1,735 mm wide, while the R16 V4 is 4,265 mm long and 1,826 mm wide.