Technically no. You can buy just a new mattress, but some of the damage done to mattresses ie the indentations are caused by insufficient frame support. So check your frame to make sure it's in good condition with nothing broken.
No, they are slightly different. Here is a chart of common sizes for sofa-bed
mattresses:
Queen - 60" x 72" or 58" x 72" or 64" x 72"
Full - 52" x 72" or 54" x 72"
Twin - 38" x 72" or 35" x 72"
Single - 24" x 72"
A children mattress is mainly between 38 on
75 inches.
An adult single mattress is around 53 on 75
inches.
A couple king size mattress is around 76 on
80 inches.
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