If you insert the compont into your existing file, the component will be displayed with your current style. If you downlad the component and open it on its own, it will show with the style the author had selected when they uploaded it.
Share your .skp file showing the bed so we can see better what you’ve got.
Purging unused elements is a good thing but you should also look at some of the used dteail. For example the headboard on this bed accounts for about 43% of the entire file size. It’s a creazy amount of geometry for what it is; especially considering that most of it is hidden by the pillows. You could replace it with a single face and a texture which would greatly help to reduce the file size.