How are they different? Sometimes, I see schedule as Monday - Friday 10am - 10pm and availability as flexible.

They do contain incongruent info at times... Maybe a few of the ladies can chime in with their perspective.  

I take them more like general guidelines unless the lady is very specific... I just ask for when I'd like to meet and we go from there.

I'll send my request, and either she's available or she's not.
Never hurts to ask.
(exception would be if she is very specific, like "Never available on weekends.")

By available mornings, it usually means they start at 3pm...

Consider them more guidelines than a guarantee.

Thanks! That helps.