Theoretically, yes. However, such esters rarely form spontaneously, because the conditions are unfavorable. Generally, to form an ester, the acid must be in a highly reactive form, such as an acyl chloride, or the alcohol must have a good leaving group amenable to transesterification. Furthermore, the steric hindrance between two such large polymers would also make the reaction difficult, as would the relative insolubility of cellulose. Internal esters of uronic acids sometimes do occur in nature, such as glucuronolactones, etc., but these are not between two polymers. If you can think of a good way to overcome these obstacles, I encourage you to see if it will work!