I have two tables each georeferenced in CartoDB with the same timestamps, can I merge the two and keep the georeferenced data so I have two sets of points but in one table?
I guess you want to append the data, but not merging it, am I right?
You can do this by applying the following SQL query in the CartoDB Editor:
INSERT INTO table1name (column1, column2, column3) SELECT column1, column2, column3 FROM table2name
This will insert all your rows from table 2 into table 1. Notice that you need to use conveniently the column names (order is important too, do not include cartodb_id!).
In case you were actually interested in merging both datasets, you can just do a column join using a column you may have in common and selecting the_geom from the dataset you want to conserve it, but from you message I think you're interested in the append option.