That isn't close to a naming collision in a legal/trademark sense. Neither the "mate" of "Sugarmate" nor the "Glu" ooh ooh ooh nearness to "Glooko" is close enough to be actionable (in the US, anyway, but in this kind of thing what else matters ¯\_(ಠ_ಠ)_/¯).

Disclaimer: IANAL but have substantial experience with anally-extracted objections to naming (and other things)