There is no equivalent nor will there ever be. Simple reason - sites like ITA Matrix rely on airlines publishing fares and availability to global distribution systems. They use this data to find and price flights across many airlines at once. Airlines do not publish this data for award travel, particularly on the fare side and sometimes even in the availability side.

Sites like ExpertFlyer will help you locate award availability for the airlines that publish award inventory data (and not all do)... but then they have no basis upon which to price it.

Other sites try to manually compile award charts from various airline websites to show you the lowest possible # of miles required between specified countries, but don’t actually check availability. Such sites are also stymied by airlines which no longer publish award charts, like Delta and United. They also tend to quickly fall out of date since it’s a huge effort to manually gather info on all the programs and maintain it.

Long story short - using a couple different sites can you help piece things together, but there is no place out there that will scan all airlines for awards and price them in miles in the style that ITA does for paid travel.