Container Config files are in /etc/pve/lxc.

cat /etc/pve/lxc/203.conf 

returns:

arch: amd64
cores: 2
features: keyctl=1,nesting=1
hostname: PiHole2
memory: 1024
net0: name=eth0,bridge=vmbr1,firewall=1,gw=192.168.1.1,hwaddr=B2:AD:91:C2:FE:BE,ip=192.168.1.52/24,type=veth
onboot: 1
ostype: ubuntu
rootfs: VM1:vm-203-disk-0,size=8G
swap: 512
unprivileged: 1

VM Config files are in /etc/pve/nodes/pve/qemu-server.

cat /etc/pve/nodes/pve/qemu-server/122.conf 

returns:

balloon: 8192
boot: order=scsi0;ide2;net0
cores: 4
cpu: host
efidisk0: VM1:vm-122-disk-1,efitype=4m,pre-enrolled-keys=1,size=4M
ide2: none,media=cdrom
machine: q35
memory: 16384
name: TrueNASScale
net0: virtio=46:23:DF:15:1D:F6,bridge=vmbr1,firewall=1
numa: 0
ostype: l26
scsi0: VM1:vm-122-disk-0,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=b1bc7679-4024-4814-ac1f-05d4d13c94a2
sockets: 1
vmgenid: 976e446a-7469-4f60-ae71-e95101357f14