This is a case where we have different understandings of the term, "restoration." Ladd and DPs use the term in different ways. I and other dispensationalists use the term "restoration" more specifically to mean that Israel will not only be saved but restored as a nation in the sense of having a specific role to play to other nations in the millennium and perhaps beyond. While Israel and all believers are saved in the same way and have the same spiritual blessings in Christ, the nation Israel has a role to play in the millennium that is not shared with other groups.
I think Arnold Fruchtenbaum is right when he states that Dispensationalists believe in both the salvation and restoration of national Israel (see Israelology: The Missing Link in Systematic Theology) while non-dispensationalists do not affirm both. HPs usually affirm a salvation but not a restoration of Israel. Restoration goes beyond salvation and indicates that national Israel will lead the nations in service, worship, and example when Jesus returns to earth—just as the OT predicted (see Isa 2). It is this meaning of "restoration" that DPs affirm and HPs usually do not. In his book, The Millennial Maze, Stanley Grenz makes this point when explicitly comparing HP with DP:
Russell Moore, who appears to take a Ladd-like view of HP states his difference with DP on this issue: "Dispensationalists, even progressives, mistakenly speak of the millennial Israel as having a 'mediatorial' role in dispensing the blessings of God to the nations." For Moore, "Scripture presents this mediatorial role as belonging to Jesus (1 Tim. 2:5). (The Kingdom of Christ, Wheaton, IL: Crossway, 118.)
When I read George Ladd and other HPs after Ladd (Grudem, Erickson, Moore, etc.), I sense that many HPs affirm a salvation of Israel and some even see Israel "restored" in the sense of being placed in their land. But I do not see them (at least Ladd and post-Ladd HPs) saying that the nation Israel will have a mediatorial role of leadership, service, and example to the other nations as prophesied in the OT. The closest thing I have seen to this is a chapter by Richard Hess, where he argues for a literal restoration of Ezekiel’s temple in the coming millennium (see "The Future Written in the Past: The Old Testament and the Millennium," in A Case for Historic Premillennialism, ed. Craig Blomberg and Sung Wook Chung, Baker, 2009, 23-36).
My purpose here has not been to argue which side is right although as a dispensationalist I believe DP is correct. But I think it fair to say that DP affirms a restoration of Israel as a national entity with a role to play to other nations in a way that HP does not.