Yes, the 524G was the first RB211-524 with Wide Chord Fan Blades, though it used the technology developed for the RB211-535E4 engine. Now, they are everywhere.
RR did consider selling the WCFB as a mod on the 524, but I guess there would be problems with thrust vs speed.
If you wanna get picky, the first RB211 with a wide chord fan was the RB211-22, which had plastic/composite blades. However, tchnology wsn't up to the job, so aluminium clappered blades became the basic standard. Or so I've been infomed by a good source.