Unterschiedlicher Abstand zwischen Überschrift und Text mit dem glossaries-Paket

\documentclass[oneside]{book}
\usepackage[utf8]{inputenc}

\usepackage[acronym]{glossaries} % Glossaries

\makeglossaries % Glossar aktivieren

\newglossaryentry{abc}%
{
    type=\acronymtype,
    name={ABC},
    description={An Be Ce},
    firstplural={ABCs1},
    plural={ABCs2},
}

\newglossaryentry{abcd}%
{
    name={ABC},
    description={Das ABC},
}

\begin{document}

\frontmatter

% Glossar, siehe glossaries-user.pdf, S. 184 ff.
\printglossary[%
    style=long,
    toctitle=Glossar,
    title=Glossar
]

% Abkürzungsverzeichnis, siehe glossaries-user.pdf, S. 184 ff.
\printglossary[%
    type=\acronymtype,
    style=long,
    toctitle=Abkürzungsverzeichnis,
    title=Abkürzungsverzeichnis
]

\mainmatter

\chapter{Introduction}
There is a \gls{abcd} theory which states that if ever anyone discovers exactly what the Universe is for and why it is here, it will instantly disappear \gls{abc} and be replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened.

\end{document}