I'd like to do half the basement with 3/8" versalock rubber tiles and half with the 5/8" carpet tiles can they be linked together? Are there 5/8" versalock tiles? and can those be matched together?

Unfortunately, those two types of tiles use different interlocking systems and cannot be used to lock together. They can be butted up against one another with the edged that are provided, which is probably preferable because they are two different thicknesses.