Is a 1964 Chevelle frame the same as 1968?

No, the frames of the 1964 and 1968 Chevelle models are not the same. The 1964 Chevelle is built on the A-body platform, which has different dimensions and design compared to the 1968 model, which underwent significant changes in styling and structural design. While both belong to the same lineage, the differences in frame construction and design reflect the evolution of the Chevelle over those years.