Assuming you are talking about tire sizes:
185/60R15 is a common tire size for small cars. The 185 refers to the width of the tire in millimeters, while the 60 denotes the sidewall height as a percentage of the width. The R indicates that it is a radial tire, and finally, the 15 represents the diameter of the wheel in inches.
195/65R15 is a slightly wider and taller tire. The extra 10mm width shouldn't present any problems on most cars, but you might have some rubbing on particularly tight suspension or bodywork. The extra 5% height might cause clearance issues on lowered cars or those with very low-profile tires. Other than that, these two sizes should be compatible.