HELP!! Need a formula to test for multiple conditions and bring back numbers with same

Greetings, I might be explaining this poorly.

I have a two tabs (March & April) column with Order numbers and due dates (with Item numbers, amount etc.)

I am trying to compare both tab data by Order Numbers with due dates, if any changes in due date in April tab I want to see old due dates from March tab with same order number line and old due date.

I can understand in VLOOKUP if order has duplicate values it only finds the first in the list, any chance "please can I have a formula which look or base more condition like other column details (item no. e.g.) to bring the same line information from other tab".

I would really appreciate any kind of help or if there is any idea to make it more handy or more clear.

Thanks for help
(attachment 20KB) took half an hour not sure its uploaded if not I will keep try to upload

link to upload file
https://samepage.io/ce4f72d019a0231d1e3e66c8758ea8923c534c23/file/232630727492118757/OBook.xlsx