why do you speak about "outputlookup"?
At first you can ingest logs from both your environments and put them into one or two indexes:
so you can put in the same search both the indexes and run something like this:
index=my_prod OR index=my_lab
| chart count over field1 BY index
in this way you can compare the number of occurrances of field1 in both the environments.
If instead you want to compare values you can run something like this:
index=my_prod OR index=mt_lab | eval field1_prod=(if index="my_prod", field1,""), field1_lab=(if index="my_lab", field1,"") | table _time field1_prod field1_lab
in this way you can compare field1 values in both the environments.
Following the above methods you can performa other comparations.
Thanks for your answer. I need to keep those both environments separate. Thats why i wanted to make a lookup at one to compare it to the other environment. I'am new with Splunk so don't know how to do check if in "old" environment has the same data as in the "new" environment.
Can you add some sample data from Prod and Lab (mask or anonymize any sensitive information before posting)?
What is the type of data and also explain what are the type of differences you are trying to capture? Please add more details for community to assist you better.