According to Egwene, Gawyn is the same height as Rand (in her sex dream that begins with him murdering Rand). Always with the exaggeration of her side and/o denigration of Rand.
It is very possible Gawyn imagines himself taller, or Rand shorter. Egwene had no control within his dream, remember?
She had control over her own thoughts. In Gawyn's dream, Rand is looming taller, but Egwene says they are the same height, when there is nearly a handstand's difference.
It's still his reality, she's just commenting on it.
She's commenting on how GAWYN'S reality is different from the reality as she perceives it. She is noting how in Gawyn's head, Rand is taller than Gawyn, while thinking that in the waking world, they are the same size.
“Tolerance is the virtue of the man without convictions.” GK Chesteron
Inde muagdhe Aes Sedai misain ye!
Deus Vult!
*MySmiley*