Ziering, 53, who plays Fin Shepard, reportedly makes $500,000 per picture, which would mean Reid, 41, earns roughly $125,000.
Reid protested the wage disparity during the filming of Sharknado 3.
Syfy responded by launching the #AprilLives or #AprilDies social campaign.
A source says the social marketing campaign was not a response to any salary negotiations.
Reid was cast in the role of Fin’s ex-wife April after Teri Hatcher, Rebecca Romijn, Tiffani Thiessen and several others had already passed.