Connecting values from measures in different tables

Hello,

I have a measure in one table and I am trying to connect the values with a measure from another table. this is a continuation from my previous question https://community.powerbi.com/t5/Desktop/Sum-of-latest-values-of-all-groups/m-p/906426#M434408

The first measure is this (Gross Sales LE): 

Gross Sales LE HELP = 
VAR __myLastAmount = CALCULATE(LASTNONBLANK(Sales[Gross Sales LE (EUR)], ""), FILTER('Sales', Sales[EntryDate] = MAX(Sales[EntryDate])))
VAR __tmpTable = SUMMARIZE('Sales',[CustID], [Year], [ProductType], [Season],"__LastAmount",__myLastAmount)
RETURN SUMX(__tmpTable,[__LastAmount])

Gross Sales LE = 
VAR __myLastAmount = CALCULATE(LASTNONBLANK(Sales[Gross Sales LE (EUR)], ""), FILTER('Sales', Sales[EntryDate] = MAX(Sales[EntryDate])))
VAR __tmpTable = SUMMARIZE('Sales',[CustID], [Year], [ProductType], [Season],"__LastAmount",__myLastAmount)
RETURN SUMX(__tmpTable,[Gross Sales LE HELP])

The measure from the second table is similar, just called Net Sales. I would like to connect these measures based on fields CustID, Year, Season, ProductType which are in both tables. Is it somehow possible?

Below is some randomize sample data I created as an example (onedrive link):

https://1drv.ms/x/s!Ag_adS5VBxzvhps3bhu0eACgyRL1Tg