The biggest difference between the Dometic 310 part 302310093 you've currently got and the Dometic Part-Timer # DOM57FR is that the Part-Timer comes with an all wood, slow-close seat where your existing model is the retail model that comes with the plastic seat. The other difference is the color, since the # DOM57FR is white where your old toilet is considered a "bone" color. There is a slightly different color available of the 310 Part-Timer with the Dometic Part-Timer RV Toilet - Standard... view full answer...