I'm fairly certain the tins contain the same as the pouches, I've only tried the chicken and ham pouches though (mostly chicken with a tiny bit of ham).

Another thing maybe worth trying if you have a Pets At Home near you they do some treats called Purely Yummy Scrummy which are chunks of 98% freeze dried chicken. My cat goes absolutely nuts for these and the best thing about them is that if you crush / rub them in your fingers they just turn into a powder. My cat is very fussy but could be made to try virtually any food if these were crumbled on top of it (feed them a few first so they get a taste for them).