The key similarities between Federalists and Anti-Federalists are in terms of agreement to a democratic or republic government and a general outline of a government. Both Federalists and Anti-Federalists agreed that states should be given power for government.
The Anti-Federalists and Federalists were unsure of which form of government would be best. They were also unsure of what rights that the government should protect. The part about which power should go to the state government and which power should go to the federal government was another issue that they were unsure of. In terms of ideological, constitutional and fundamental thinking, both Anti-Federalists and Federalists did not really have much difference in thinking.