Had the time do some research now:
Entering the 1970s, Triumph decided on a two-pronged attack on the sports car market: Bullet was the TR6 replacement incorporating, like the Stag, a roll-over bar and T-bar. Lynx was the closed coupé, to replace the GT6. Like all Triumphs since the Herald in 1959 (and excluding the Karmann-designed TR6), both cars were styled by Michelotti.
so Bullet on the left - Lynx on the right