No, they are not
-L / --scale-low <scale>: lower bound of image scale estimate
-H / --scale-high <scale>: upper bound of image scale estimate

What you are referring to are:
-3 / --ra <degrees or hh:mm:ss>: only search in indexes within 'radius' of the
field center given by 'ra' and 'dec'
-4 / --dec <degrees or [+-]dd:mm:ss>: only search in indexes within 'radius'
of the field center given by 'ra' and 'dec'

and additionally radius for searching from ra/dec

-5 / --radius <degrees>: only search in indexes within 'radius' of the field
center given by ('ra', 'dec')