First of all, you have to know that HP took over the Samsung printer division several years ago. This means that the product information can be found on the HP homepage.
The manual for the CLX-318x series on page 133 lists the accessories you are looking for. Waste toner container - CLT-W409.
So this is the right one.
http://h10032.www1.hp.com/ctg...
All compatible printer models are listed in the article's accessories. This indeed includes model 635534 Samsung SL-C460W (WLAN, Laser/LED, Black, Grey) .