Compiling Partially Matching Data Into Matching Rows With Macro

My task is to combine two large databases into one spreadsheet by extending the number of columns. The data from each database is 90% matching based on an identification number, however occasionally there are additional rows or unmatched identification numbers that need to be kept for analysis.

When this happens, there needs to be a blank row inserted to represent the missing data in the rest of the corresponding row.

I am having trouble finding a quick way to do this because I have approximately 12,000 rows (and columns up to DV when combined).

for example:

p1
data
data
data
data
p2
data
data
data
data

[Code] .....

needs to become:

p1
data
data
data
data

[Code] .....

I am guessing I will need a macro of sorts, So far I have made one column that tell me if the ID's are matching or not (1 or 0) and if they are not matching (0) I manually insert the rest of the row that is missing or make space for the duplicate data (which needs to remain).