Thank you But this "playing" is known to me as well.
I'm not sure if you understand how these keys were received. I made the same example some weeks ago.

I just add the order to the private key 363d541eb611abee and received the outside private fffffffffffffffffffffffffffffffebaaedce6af48a03bf60fb2ab8647ed2f
But it is not a collision. It just play with a modular mathematics. This works beacuse the private keys are repeating after the order (the order actually is 0 in bitcoin EDCSA math).

I want to find at least two (better more of course) private keys within the bitcoin range and leading to the same btc address.

PS. It looks like you took my own example from another topic and post it here 
Here is my post with the same example: https://bitcointalk.org/index.php?topic=5166284.msg52493665#msg52493665