Waw! Not easy (for me).
Coins of 15 mm are already rather small. Coins of 10 mm are small! Nevertheless they are also Akçes.
The obverses of your second and third coin make them almost certainly Süleyman I coins.
I took your nr. 3, because it has the year 926 below on its
reverse, so, a Süleiman I without doubt. But if you look on the www for "Süleyman I Akçe 926 AH", you will find that every
mint has struck its own
reverse. And there are many. I think, your coin was struck in Kastamonu.
Your nr. 1 might be a Mehmed II Akçe.
Your nr. 4 I
still did not look.