I have samples of both French Lover and Olibanum and I must admit I don't find they are similar at all. French Lover is mostly about galbanum and cedar while Olibanum is light incense and sandalwood. If anything, I would say Olibanum is more like 10 Corso Como in feel. I don't really think either of these are that similar to the Gucci; perhaps French Lover, but still, not particularly so.
I definitely find certain similarities between Geranium Pour Monsieur and Roadster, the most obvious being the mint. Especially in the top notes. However after this the geranium note steers Pour Monsieur away in a different direction and ultimately I think the Malle is a more sophisticated and quirky take on mint. If I'm being honest, I don't really like either of these, but that is only my personal opinion.