Its basic(!) syntax is mostly that of QBasic. As, indeed, the original author points out. And much of VB's syntax also derives from QB. So there's some compatiblity there as a result.
But I think you may be confusing (vague) compatability with cloning. Some of the source code may be compatible but sgnificant amounts are not (PEEK, POKE, INKEY$, CALLBACK, CODEPTR, Financial functions, memory functions ... just off the top of my head), and the two IDEs are completely different, the types of projects that can be compiled are entirely different, the compilation results are different, ...