Step 1: Understand interstitial hydrides.
Some metals soak up hydrogen atoms into the empty gaps (voids) of their crystal. These are interstitial hydrides. The small hydrogen atoms slip into the spaces without breaking the metal's arrangement.
Step 2: Know the key feature asked.
The question wants metals whose hydride keeps the same lattice (crystal arrangement) as the bare metal. So we want metals that simply absorb hydrogen into voids while the metal framework stays the same.
Step 3: Check Ni and Pd.
Nickel and palladium are famous for absorbing hydrogen into their lattice voids. Palladium can take in a large amount of hydrogen and still keep its metallic structure. So this pair fits perfectly.
Step 4: Rule out Yb and Cs.
Ytterbium and cesium tend to form ionic (salt-like) hydrides rather than simple interstitial ones. Their hydrides do not keep the plain metallic lattice in the way asked. So options with Yb or Cs are out.
Step 5: Compare with V and Zr.
Vanadium and zirconium do form hydrides, but they are not the best answer for hydrides that keep the same lattice as the parent metal in the classical textbook sense.
Step 6: State the answer.
The correct pair is \[ \boxed{\text{Ni, Pd}} \]