The 'quote' for labor is relative to the installation only in so far as the slider R /O is a fit for the replacement...apparently you have a standard R / O and no complications involved..otherwise, the cost goes up accordingly.
{..R /O means rough opening...} if your new one were bigger, or taller, or the old one has been structurally a compromise to the structure, the cost of installation of a new one would change according to how much work it takes to fix or adjust or accommodate the installation.
I dont know much about the blinds. Sorry.