Possible upgrade from an 18 intex ultra frame to 26 intex ultra frame.

Had 18" intex pool for three years but sold it to a neighbor at the end of last summer so I could upgrade to the 26 intex. I'm second guessing the idea because of the added ground prep expense and whether or not I need to buy a new sand filter pump. I have Intex Krystal Clear Sand Filter Pump: flow rate: 2,150 gal, has built-in 24-hour timer6-function control, Model# 28647EG. Wishful thoughts of using same sand pump which worked beautifully for 18. Is the reality a larger pump?Has anyone else upgraded with the same situation? I currently have current ground prep for the 18 which is sand that is packed tight as it has been used as base for last three years.
 
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