Is line to line voltage equal to line voltage?

Yes. By definition, a line-to-line voltage is indeed called a line voltage.

For delta-connected, three-wire, systems comprise three line conductors. The line voltage is numerically equal to the phase voltage.

For wye-connected, four-wire, systems comprise three line conductors and a neutral conductor. Any line-to-neutral voltage is called a phase voltage. The line voltage is 1.732 times the value of the phase voltage.