Huxleypig is correct - the first is an ABLOY Profile, the second looks like an ABLOY Disclock.
Both can be disassembled without a key!!!
The Disclock will be easier. From the back, the retainer clip is round and layers over itself. Find the end, and using a sharp pick (like a dental pick) to lift the end barely high enough to clear the plug
. Use another tool to hold the end up, then carefully
work your way around the plug, gradually lifting more and more of the clip up the the back of the plug. Twice around the plug, and the clip will be out! Just be careful not to bend the clip when removing it. Once the clip is removed, hold the lock with the keyway up, and lift the body of the lock off the plug (properly called a carrier with an ABLOY).
The Profile lock has a slightly different process to disassemble. The clip will need to be turned. Get the end of the clip lifted into the gap you see in the back of the lock, then carefully rotate the clip in place, feeding more and more of the clip into the gap until the clip is entirely out. Then, like the Disclock, hold the lock keyway up, and lift the lock body (also called a shell) off the carrier.
Once you have the clip off, the Exec should come apart like the Disclock, with the same type of parts inside. There is a writeup on the guts of the Disclock here
Have fun, and keep us posted. If you want to trader or sell that Australian oval Exec lock (the bottom one in your pictures), send me a PM!
Just when you think you've learned it all, that is when you find you haven't learned anything yet.