how can I use vfill in beamer

Question

I have 2 slides, for which I want logos to be at the bottom, on the same spot. I thought I could use \vfill, but the logos have different distances from the bottom of the slides. How can I solve this? my doc:

\title{Compact State Space Representation for Quantum Deep 
Reinforcement Learning with the Help of Auto Encoders}
\author{Elias Brandstetter}
\begin{document}
 \begin{frame}[plain]
  \centering
  \normalsize
  \maketitle
  \vfill
  \begin{figure}
    \includegraphics[width=.24\textwidth]{images/logo_jlu.jpeg}
    \hspace{20mm}
    \includegraphics[width=.24\textwidth]{images/logo_dfki.jpg}
  \end{figure}
 \end{frame}
\begin{frame}[plain]
  \centering
  \Large 
  Bachelor Thesis\
  \normalsize
  \vspace{5mm}
  Entry Presentation\
  \vspace{10mm}
  Examiners:\
  \vspace{3mm}
  \begin{tabular}{c c c}
   apl. Prof Jens Sören Lange & - & JLU Giessen\
   Prof. Dr. Dr. h.c. Frank Kirchner & - & DKFI Bremen
  \end{tabular}
  \vfill
  \begin{figure}
   \includegraphics[width=.24\textwidth]{images/logo_jlu.jpeg}
   \hspace{20mm}
   \includegraphics[width=.24\textwidth]{images/logo_dfki.jpg}
  \end{figure}
 \end{frame}
\end{document

the resulting slides have very different spacing at the bottom:

try \vskip0pt plus 1filll ... I have found that here: https://tex.stackexchange.com/a/41988/120578 and using with success for years — koleygr, Jan 06 '22 at 13:00
As far as I am aware, \vfil and \vfill are equivalent, if not combined? but changed to latter, for simplicity's sake. — eli44, Jan 06 '22 at 13:02
@koleygr thanks, that worked (: .. can't believe I didn't find that — eli44, Jan 06 '22 at 13:03

how can I use vfill in beamer

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