Autofill a 2nd text box when 1st text box is filled in

i'm working on multi-page document in acrobat x pro.

 

in document, there text box on first page.  once box filled in, i'd box on page 4 autofill same information.  issue here text box on page 4 needs have different field name first in order merge pick these fields in order.

 

so if "dcef" entered on page 1 in "other1" text field, i'd "dcef" autofill on page 4 in "other1a" text field.

 

i'm new javascript , not sure if possible...but if so, how done?

 

thank you!

use custom calculation script:

event.value = this.getfield("other1").value;

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