Short answer, yes, there can be a ton of variation especially if it is just an S1 and not a WORKED fem line. fem beans are the same as M/F as far SELECTION, SELECTION, AND SELECTION being the top 3 most important things when breeding them...
For a long and somewhat scientific answer and discussion of fem beans lead by TomHill:
https://www.icmag.com/ic/showthread.php?t=234619
enjoy