Gosh... I hope not. I have trouble matching my socks!
I use whatever my hand falls on... or fits the job. Green ones, yellow ones, clear ones, frosted ones. I DO, however, always use the same ruler or same brand of ruler during one project. UNLESS it's a WIP. If it's a WIP, then I have no stinking clue about which ruler or which cutter... or sometimes, which fabric I was using or planning to use!
My mind... a scary place to be! :mrgreen: