Need to compare data on sheet 1 vs sheet 2 and show results on sheet 3

Locate $ difference.xlsxHello & i appreciate your time (in advance),

I have data from Yesterdays orders on Sheet 1. Data from Todays orders on Sheet 2. On sheet 3 I want Excel to use the concatenated Order # in column D on sheet 2 (Today), look for the exact match in column D on Sheet 1 (Yesterday), and IF a match is found compare the pricing in column BT from both sheets. And continue the same for each Order # on sheet 2.

After all that, on the results on sheet 3 I want to add conditional formatting to show:
1) If Today's pricing is more than Yesterday's (aka OVER, fill colour GREEN on the Order #)
2) If Today's pricing is less that Yesterday's (aka UNDER, fill colour RED on the Order #)
3) If Today has an order that wasn't on yesterdays list (aka NEW, fill colour YELLOW on the Order #)
4) If Today's pricing is the same as Yesterday's (no colour needed on the Order #)

What I need to know from the results is if an order from yesterday is still waiting to be shipped today, if that order's pricing has changed, and what the difference in pricing is.

I have attached a sample of the very large Data dump. I need the columns to stay the same as this is how the information is transferred from our database. Also just a heads up, a normal day's data will actually be between 400 and 800 rows long, but i shortened the example to just a couple rows.

Sheet 4 is what I hope the results will look like on sheet 3.

Please let me know if you need more info.