I've been looking at online catalogs (Shineray, Zongshen, etc.), checking out the specs on various models. How accurate are the specs in general?

For example, if you look at the English Shineray catalog, the 150GY-B has dimensions of 2080x830x1240, but the Chinese catalog lists them as 2120x820x1155. All the other specs differ, too.

http://www.shineray.com/products-liebiao.asp?id=75
http://www.shineray.com.cn/product_0...36305;车

I'm mostly interested in power, and seat height.