I'm not sure about their sexes, but I'm pretty sure that the plecos in picture 1, 9 and 14 are L-134 as their patterns are variable.
Some of mine are highly spotted or blotched like that too.
I'm pretty sure that fish
1, 2, 3, 5 are male.
4, 6, 7, 8, 10 are unknown.
9, 11, 12, 13, 14 female.
"unknown" means that they do not show signs of being heavy with eggs like the "female" fish, whilst they are also not showing signs of the "hairy backend" that the males have. They may, given some good food and calmness become easier to sex and end up showing either male or female indications in the future.