InfoPath Dev

Hello,
I am having trouble with the following situation:

I have two forms (Form1 published in Form Libray1 and Form2 published in Form Library2), basically the Form2 receives the data from Form1 and in the Form2 users can enter a number that is subtracted from the quantity brought from Form1.

I need the difference between the number of Form1 and number of Form2, this number needs to be recorded in both forms libraries.
Ps.: Form2 has a field that calculate the difference.

My questions:
1 - Is there any codeless solution and without publish the form2 in Lybrary of Form1?

Regards,
Léo

Could you add SharePoint only to calculate the value for that library?

You could then add the field to the form and onload copy that from the library in SharePoint into the form (if you need it in the XML) otherwise you could just have one colum in SharePoint with the calucated value.