The similarities are purely based upon a philosophical approach adopted by Howard, rather than any personal similarity or genuine like-mindedness...
The common thread that exists between the approaches of Menzies and Howard, is the emphasis and promotion of the individual and the term 'mainstream' which is bandered about so often. More specifically however, there are immense differences that exist, not in the philosophical policy objectives of each, but rather the means implemented in attaining those objectives.
Since the permeation of 'neo-liberal' thought end 'economic rationalism' throughout much of the world in the 1980's, a progression right has occured on the political spectrum, which has fundamentally served to further remove the approach Liberal party of 2005, to that of the the created party in 1944...
The following quote from the Liberal Party website itself, encapsulates the plight of Menzies in establishing a "Liberal" party:
what we must look for, and it is a matter of desperate importance to our society, is a true revival of liberal thought which will work for social justice and security, for national power and national progress, and for the full development of the individual citizen, though not through the dull and deadening process of socialism
The terminology and emphases are in fact very similar to the rhetoric that is so prevalent in the modern political and social climate...
Howard was well aware of the importance of mainstream support and applied the very basic tenets of Menzies rationale in his quest for support. The public devotion has expresses to the man clearly indicates..."the best friend the Australian worker has ever had" etc etc, the loss of traditional 'Labor heartland and mainstream' seats etc etc...
The following is from an address made by Howard at the 50th anniversary celebration of the Liberal Party...
We are not a party that is dominated by sectional interests, we are a party that’s always tried to govern for the mainstream
Again there is the reiteration of 'mainstream' which was a key founding principle promoted by Menzies himself. .... 'aint that a grand old term..gotta love our mainstream..as Mr Latham is now again part of the mainstream, maybe he'll adopt the Liberal vote...
In a 'politically' ideological sense, the connections are extremely lucid, however economically, the immense differences begin to emerge..