>I have a field from a table in a database which I need to update from the same table in the same database but from another server. Both tables are the same. I just need to fix all the records with the same values as the other table as one SQL select I did emptied the related field.
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>As this is from two different servers, do I need to do that in two steps or because the SSMS can see both servers there would be a way to synchronize that in one command?

If I understood you correctly now, you can create in your server a linked server to the one that has the correct data, then you can just use it in an update statement, something like

update yourDB.yourSchema.YourTable
set YourField = o.YourField from YourDB.YourSchema.YourTable m
join  [theOtherServer\theOtherInstance].YourDB.YourSchema.YourTable o on o.pk = m.pk

(Assuming the Schemas/Database also match, otherwise adjust as necessary.